Could you clearly explain the limitations to using Free Spire.XLS vs regular Spire.XLS? Free Spire.XLS seems to work fine for me, so why would I purchase a license?
Thanks.
Workbook workbook = new Workbook();
//set the version
workbook.Version = ExcelVersion.Version2007;
//your code...
workbook.SaveToFile("result.xlsx",ExcelVersion.Version2007);